Why does a red blood cell have a biconcave shape?
A. To decrease the surface area, therefore restricting the volume of oxygen lost from the cell
B. To provide a large surface area for the active transport of oxygen in and out of the cell
C. To increase the available surface area, so more oxygen can diffuse in and out of the cell
D. To increase the volume of the cell, so more genetic material can be carried around the body
Select your answer:
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Disease, Immunity, and Phatogens › ViewWhat is a vaccine?
A. A weakened pathogen injected in the body to produce immunity
B. Temporary immunity that develops as natural exposure
C. An overreaction of the immune system
D. Medicine that helps after you’re infected
Philosophy › View
What makes a bad decision bad? A question that falls under the branch of Philosophy called _________.
A. Logic
B. Epistemology
C. Ethics
D. Metaphysics